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Effect of bed elevation discordance in the main river on the confluence hydrodynamics in 90o straight-channels’ confluences

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Authors
Đorđević, Dejana
Contributors
Schleiss, Anton J.
de Cesare, Giovanni
Franca, Mario J.
Pfister, Michael
Conference object (Published version)
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Taylor & Francis Group
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Abstract
A role of the difference in bed elevations in the main-river (ΔzMR) at its entrance to a 90º straight-channels' confluence is studied numerically using a 3D finite-volume model. Three characteristic hydrological scenarios with DR = {0.250, 0.583, 0.750} are analysed in four confluence layouts having ΔzMR / hd [0.0, 0.50] (where hd stands for the flow depth in the deeper canal at the confluence). It is found that: 1) a portion of the tribu-tary flow in the bottom layers is entrained by the bed-step, 2) the w- velocity has the same order of magnitude as Vxy for ΔzMR ≥ 0.25hd and DR > 0.5, 3) the opposite bank is endangered by erosion due to strong upward motion along this bank, 4) additional shear layer develops on the outer side of the distorted umax-core and 5) the presence of bed-step favours bed-load transport both in and far downstream of the confluence.
Keywords:
river confluence / bed elevation discordance in the main river / flow angles δ and φ / size of the recirculation zone / shear layer / bed shear stress distribution
Source:
River Flow 2014, Proceedings of the International Conference on Fluvial Hydraulics, Lausanne, Switzerland, 3-5 September 2014, 2014, 997-1005
Publisher:
  • CRC Press, Taylor & Francis Group
Projects:
  • Monitoring and Modeling of Rivers and Reservoirs (MORE) - Physical, Chemical, Biological and Morphodynamic Parameters (RS-37009)
  • Urban Drainage Systems as Key Infrastructure in Cities and Towns (RS-37010)

DOI: 10.1201/b17133

ISBN: 978-1-138-02674-2

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URI
http://grafar.grf.bg.ac.rs/handle/123456789/1858
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